The only troubles that have been addressed are running the 10.5 and slower slotted sensored motors with 4-cell oval and 12th scale. The rollouts on these cars is crazy, something like the car would have to travel almost 5" to get a position reading on the motor and it has trouble starting them. Running mod, all day long guys. It's crazy-nut fast in my tourer with the higher kV motors on only 2s. You guys won't have any problems with them running offroad and such, I surely can't complain about being able to pull the wheels off the ground cruising at half throttle and stabbing it